Boston Marathon logo
BOSTON MARATHON 2023

Jack Cahill

Bib: 26407•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
9:10/mi
28:30
↑ 97↓ 3451.5%
10K· 6.21 mi
8:48/mi
55:50
↑ 79↓ 1380.4%
15K· 9.32 mi
8:25/mi
1:22:00
↑ 67↓ 78
20K· 12.43 mi
8:31/mi
1:48:27
↑ 106↓ 860.1%
Half· 13.11 mi
8:48/mi
1:54:27
↑ 19↓ 370.5%
25K· 15.53 mi
9:47/mi
2:18:10
↑ 66↓ 880.2%
30K· 18.64 mi
9:01/mi
2:46:12
↑ 181↓ 1480.2%
20M
9:31/mi
2:59:08
↑ 64↓ 500.2%
21M
10:51/mi
3:09:59
↑ 106↓ 241.6%
35K· 21.75 mi
8:44/mi
3:16:31
↑ 17↓ 861.7%
23M
9:13/mi
3:28:03
↑ 23↓ 630.6%
24M
9:08/mi
3:37:11
↓ 821.3%
40K· 24.85 mi
9:02/mi
3:44:54
↓ 200.3%
25.2M
10:09/mi
3:48:24
↑ 13↓ 160.2%
Finish· 26.22 mi
8:04/mi
3:56:37
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:27
Pace8:44 /mi
2nd Half
Distance13.11 mi
Time2:02:10
Pace9:19 /mi
📊Positive Split: 6.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:45:2628:309:1028:30
9:10
-
10K
6.21 mi12:12:4655:508:5927:20
8:48
-0:22
15K
9.32 mi12:38:561:22:008:4826:10
8:25
-0:23
20K
12.43 mi13:05:231:48:278:4426:27
8:31
+0:06
Half
13.11 mi13:11:231:54:278:446:00
8:48
+0:17
25K
15.53 mi13:35:062:18:108:5423:43
9:47
+0:59
30K
18.64 mi14:03:082:46:128:5528:02
9:01
-0:46
20M
20.00 mi14:16:042:59:088:5712:56
9:31
+0:30
21M
21.00 mi14:26:553:09:599:0310:51
10:51
+1:20
35K
21.75 mi14:33:273:16:319:026:32
8:44
-2:07
23M
23.00 mi14:44:593:28:039:0311:32
9:13
+0:29
24M
24.00 mi14:54:073:37:119:039:08
9:08
-0:05
40K
24.85 mi15:01:503:44:549:037:43
9:02
-0:06
25.2M
25.20 mi15:05:203:48:249:043:30
10:09
+1:07
Finish
26.22 mi15:13:333:56:379:028:13
8:04
-2:05

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

8:04 /mi

Average Pace

9:02 /mi

Slowest Pace

10:51 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:00:50

26% of race

Time at Steady Pace

2:04:47

53% of race

Time at Slower Pace

51:00

22% of race

Average Pace: 9:01 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:45:2628:309:1028:30
9:10
#21128
10K
6.21 mi12:12:4655:508:5927:20
8:48
#20585
15K
9.32 mi12:38:561:22:008:4826:10
8:25
#19596
20K
12.43 mi13:05:231:48:278:4426:27
8:31
#18934
Half
13.11 mi13:11:231:54:278:446:00
8:48
#18969
25K
15.53 mi13:35:062:18:108:5423:43
9:47
#19594
30K
18.64 mi14:03:082:46:128:5528:02
9:01
#19187
20M
20.00 mi14:16:042:59:088:5712:56
9:31
#19151
21M
21.00 mi14:26:553:09:599:0310:51
10:51
#19273
35K
21.75 mi14:33:273:16:319:026:32
8:44
#19181
23M
23.00 mi14:44:593:28:039:0311:32
9:13
#19059
24M
24.00 mi14:54:073:37:119:039:08
9:08
#19003
40K
24.85 mi15:01:503:44:549:037:43
9:02
#18897
25.2M
25.20 mi15:05:203:48:249:043:30
10:09
#18887
Finish
26.22 mi15:13:333:56:379:028:13
8:04
#18682
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi21128126711267117285(Top 65%)11168(Top 74%)11168(Top 211%)
10K6.21 mi3.10 mi20585+54312483+18812483+18819903(Top 75%)12239(Top 81%)12239(Top 232%)
15K9.32 mi3.11 mi19596+98912066+41712066+41717285(Top 65%)11168(Top 74%)11168(Top 211%)
20K12.43 mi3.11 mi18934+66211829+23711829+23716938(Top 64%)11026(Top 73%)11026(Top 209%)
Half13.11 mi0.68 mi18969-3511845-1611845-1619420(Top 73%)12061(Top 79%)12061(Top 228%)
25K15.53 mi2.42 mi19594-62512093-24812093-24821679(Top 81%)12999(Top 86%)12999(Top 246%)
30K18.64 mi3.11 mi19187+40711917+17611917+17617297(Top 65%)11036(Top 73%)11036(Top 209%)
20M20.00 mi1.36 mi19151+3611888+2911888+2918908(Top 71%)11638(Top 77%)11638(Top 220%)
21M21.00 mi1.00 mi19273-12211925-3711925-3720483(Top 77%)12274(Top 81%)12274(Top 232%)
35K21.75 mi0.75 mi19181+9211878+4711878+4716580(Top 62%)10532(Top 69%)10532(Top 199%)
23M23.00 mi1.25 mi19059+12211819+5911819+5917106(Top 64%)10741(Top 71%)10741(Top 203%)
24M24.00 mi1.00 mi19003+5611781+3811781+3817799(Top 67%)10981(Top 72%)10981(Top 208%)
40K24.85 mi0.85 mi18897+10611734+4711734+4716268(Top 61%)10249(Top 68%)10249(Top 194%)
25.2M25.20 mi0.35 mi18887+1011724+1011724+1017920(Top 67%)10979(Top 72%)10979(Top 208%)
Finish26.22 mi1.02 mi18682+20511620+10411620+10412558(Top 47%)8565(Top 56%)8565(Top 162%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21story building
+97ft-345ft

Overall

17285

Males

11168

M18-39

11168

5K→10K

3.1 - 6.2 mi

Top 75%
×5story building
+79ft-138ft

Overall

19903

Males

12239

M18-39

12239

10K→15K

6.2 - 9.3 mi

Top 65%
×3story building
+67ft-78ft

Overall

17285

Males

11168

M18-39

11168

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

16938

Males

11026

M18-39

11026

20K→Half

12.4 - 13.1 mi

Top 73%
×2story building
+19ft-37ft

Overall

19420

Males

12061

M18-39

12061

Half→25K

13.1 - 15.5 mi

Top 81%
×4story building
+66ft-88ft

Overall

21679

Males

12999

M18-39

12999

25K→30K

15.5 - 18.6 mi

Top 65%
×9story building
+181ft-148ft

Overall

17297

Males

11036

M18-39

11036

30K→20M

18.6 - 20.0 mi

Top 71%
×5story building
+64ft-50ft

Overall

18908

Males

11638

M18-39

11638

20M→21M

20.0 - 21.0 mi

Top 77%
×8story building
+106ft-24ft

Overall

20483

Males

12274

M18-39

12274

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

16580

Males

10532

M18-39

10532

35K→23M

21.8 - 23.0 mi

Top 64%
×5story building
+23ft-63ft

Overall

17106

Males

10741

M18-39

10741

23M→24M

23.0 - 24.0 mi

Top 67%
×6story building
+12ft-82ft

Overall

17799

Males

10981

M18-39

10981

24M→40K

24.0 - 24.9 mi

Top 61%
×1story
+6ft-20ft

Overall

16268

Males

10249

M18-39

10249

40K→25.2M

24.9 - 25.2 mi

Top 67%
×1story
+13ft-16ft

Overall

17920

Males

10979

M18-39

10979

25.2M→Finish

25.2 - 26.2 mi

Top 47%
×2story building
+22ft-21ft

Overall

12558

Males

8565

M18-39

8565

Passing Analysis

Category:
Athletes Passed
3608
Passed By
1162
Net Change
+2446
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21128
5K → 10K656113+543#21128#20585
10K → 15K9945+989#20585#19596
15K → 20K6653+662#19596#18934
20K → Half1651-35#18934#18969
Half → 25K23648-625#18969#19594
25K → 30K42720+407#19594#19187
30K → 20M10468+36#19187#19151
20M → 21M42164-122#19151#19273
21M → 35K964+92#19273#19181
35K → 23M14220+122#19181#19059
23M → 24M8731+56#19059#19003
24M → 40K1159+106#19003#18897
40K → 25.2M3424+10#18897#18887
25.2M → Finish2072+205#18887#18682
TOTALS36081162+2446
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing